Communication method and system based on RS485 bus, computer equipment and storage medium

Abstract

The invention provides a communication method and system based on an RS485 bus, computer equipment and a storage medium, and the method comprises the steps: generating an address association table according to the address identifiers of a master station and all slave stations; when each slave station receives the broadcast data sent by the master station, whether a response message needs to be sent currently is judged; if the current slave station judges that the response message does not need to be sent currently, the current slave station judges whether the response message sent by the associated station is received or not; if the current slave station receives a response message sent by the associated station, the current slave station sends a target response message, so that the master station receives the target response message sent by the current slave station through the RS485 bus; the problem of data loss or abnormal communication in the prior art is solved, the slave station nodes sequentially carry out communication response, the communication interaction frequency is reduced, data conflicts are avoided, and the communication efficiency and reliability of the RS485 bus are improved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a communication method, system, computer equipment and storage medium based on the RS485 bus. Background technique [0002] With the development of automated production lines, intelligent manufacturing, digital factories, etc., universal controllers are more and more widely used, and more and more modules for sampling and control signals need to be connected to the controller, which affects the scalability of the controller. And communication speed puts forward higher requirements. As a two-wire differential bus, RS-485 has the characteristics of supporting multiple nodes, long communication distance, and strong anti-interference. The bus network topology generally adopts a terminal-matched bus structure. At the same time, RS485 communication usually adopts half-duplex mode, and the bus can only handle one communication at the same time. When a station makes a dat...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the communication method, system, computer equipment and storage medium based on the RS485 bus provided by the present invention solve the problem of data loss or abnormal communication in the prior art, and realize that the slave station nodes sequentially Communication response, not only reduces the communication interaction frequency but also avoids data conflicts, improving the communication efficiency and reliability of the RS485 bus

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